Orbot for Android 16.6.0 RC 2

just a little clean-up thanks to @bitmold

8a0582d (origin/master, origin/HEAD) remove persistent notification on oreo+ take2
5c33009 use default locale, not english for #588
750d5f4 Closes #610, one less string to translate too
9528f2f removed unused strings from Orbot main app; some unused ones that may be reused in the future still exist here
aa575d5 removed a lot of lintable warnings, code cleanup
e4454a6 DNSProxy -> DNSResolver; clenaup unused code
5142d0e Merge branch 'master' of https://github.com/guardianproject/orbot
2b5760d update CHANGELOG for v16.6 RC 1
e79b3b3 some code cleanup